Wow, this tool from @themarkup to test whether or not t.co links are throttled is *something*.

✅ NYTimes, WSJ, Washington Post, et al resolve in ~40ms.
❌ Facebook, Instagram, Threads, Bluesky URLs take ~2.5s.

Test your own:
https://themarkup.org/investigations/2023/09/15/twitter-is-still-throttling-competitors-links-check-for-yourself#2023-twitter-throttle_tester